Rapper Jay-Z and his wife Beyoncé Knowles have just spent their fifth anniversary in Cuba, exploring an island where most Americans cannot set foot.

The US trade embargo against the Castro regime bars such trips, but the Treasury Department reportedly approved it as a “cultural visit.” No surprise here: The couple is rich and well-connected — Beyoncé even lip-synched the national anthem at President Obama’s inauguration in January.

Some Cuban-American lawmakers are furious about the couple’s special treatment. But our concern isn’t what the US government is doing to let Americans enter Cuba — it’s what the government is doing to make sure Americans can leave.

US government contractor Alan Gross has been locked up since he was arrested at the Havana airport in 2009 and sentenced to 15 years in Castro’s prisons for helping Cuban Jews connect to the Internet.

It’s bad enough the Treasury Department is eager to accommodate wealthy celebrities who want to enjoy Havana’s nightlife. It’s so much worse that the State Department is apparently unable to free an American in its employ who has spent nearly 1,500 nights in Cuban chains.